Technical Bulletin
Issue Date
November 15, 2002
7351J Very Intelligent Early Warning (VIEW)
Laser Smoke Detector
Introduction
2
Prerequisites
2
General Description
3
Installation Procedures
5
Pre-Installation Guidelines
5
Detector Installation Procedure
6
Limiting Dust Exposure
6
Testing and Maintenance Procedures
7
Testing
7
Maintenance
10
Laser Safety Information
12
Limitations
13
© 2002 Johnson Controls, Inc.
Code No. LIT-408092
1
www.johnsoncontrols.com
Introduction
This document contains important information about installing,
maintaining, testing, and operating the Johnson Controls 7351J VIEW
laser detector. This detector is manufactured by System Sensor for use
with Johnson Controls fire alarm systems. If you install this detector for
someone else to use, leave a copy of this document with the user.
Prerequisites
Before you install any 7351J VIEW laser detectors, read and become
familiar with the following:
•
the installation manual for the control panel system
•
the requirements of the Authority Having Jurisdiction (AHJ)
Select the publications that are relevant to this installation:
•
National Fire Protection Association (NFPA) 72 National Fire Alarm
Code
•
for non-United States installations, the applicable codes and standards
specific to the country and locality of installation
!
CAUTION: Risk of Equipment Failure.
Failure to follow these directions may result in failure of this device to report an
alarm or trouble condition or respond properly to an alarm condition.
Johnson Controls is not responsible for devices that were improperly installed,
tested, or maintained by others.
Standards
As is the case with all installations under NFPA, Underwriter’s
Laboratories®, Inc. (UL), Underwriter’s Laboratories of Canada (ULC),
or Canadian Electrical Code classification, final written approval of
permissible operation and configuration rests with the Authority Having
Jurisdiction (AHJ).
Johnson Controls smoke detectors are marked with a compatibility
identifier—the last digit of the five-digit code stamped on the base of the
product. Connect detectors to compatible control units only. For a list of
UL-Listed control units and detectors, refer to the Johnson Controls
Device Compatibility Technical Bulletin (LIT-445180).
2
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
General
Description
The 7351J is a plug-in type smoke sensor that has a laser-based
photoelectronic sensing chamber. Using FlashScan® communication
protocol on the Signaling Line Circuit (SLC), the sensor uses
analog-addressable communications to transmit smoke density and other
information to the central panel.
The use of a laser diode provides substantial improvements in
signal-to-noise ratio compared to a traditional Light-Emitting Diode
(LED) light source. The sensor transmits an analog representation of
smoke density over a multiplexed SLC to the Intelligent Fire Controller
(IFC) control panel. Rotary switches are provided for setting the IFC
panel’s SLC sensor address (1-159).
The sensor has two multicolored LEDs controlled by the panel to indicate
sensor status. Flashing green indicates normal operation and steady red
indicates alarm, pre-alarm, or trouble.
An output is provided for connection to an optional remote LED alarm
annunciator (Model RA400Z).
Test LED
Laser Diode and
Intergral Lens
Assembly
Smoke
Direction Baffles
Sensing Chamber
Laser Beam
Mirror Detail
Light Trap
Photo Receiver
Mirror
(See detail at right.)
lpx751_1
Figure 1: Inside the 7351J
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
3
Table 1: Technical Specifications
Operating Voltage Range
15 to 32 VDC
Maximum Standby Current
230 microamperes at 24 VDC (no
communication)
Maximum Average Standby
Current
330 microamperes at 24 VDC (one
communication every 5 seconds with LED blink
enabled)
Maximum Alarm Current
6.5 milliamperes at 24 VDC (LED on)
Operating Humidity Range
10 to 93% RH, noncondensing
Operating Temperature Range
0 to 38°C (32 to 100°F) UL Listed range
Shipping Weight
164 g (5.8 oz)
Agency Listings
UL Listed (S1948), FM approved, MSFM, MEA,
CSFM
Dimensions (Installed in Specified Base)
B210LPJ
Height:
Diameter:
43 mm (1.7 in.)
155 mm (6.1 in.)
B501J
Height:
Diameter:
43 mm (1.7 in.)
104 mm (4.1 in.)
B501H and B501BHT
Height:
Diameter:
56 mm (2.2 in.)
152 mm (6 in.)
B224BI and B224RB
Height:
Diameter:
51 mm (2 in.)
155 mm (6.1 in.)
Accessories
4
Part Number
Standard United States Low
Profile Base
B210LPJ
Standard European Flangless
Surface Base
B501J
Sounder base; includes B501
Base
B501BH
Intelligent Relay Base
B224RB
Intelligent Isolator Base; Isolates
Signaling Line Circuit from
Electrical Shorts
B224BI
Retrofit Replacement Flange for
B501BJ Base
F110
Remote LED Annunciator
RA400Z
Surface Mounting Kit (B501J
Bases only)
SMK400
Test Magnet
M02-04-01
Detector Removal Tool
XR-2
Extension Pole for XR-2
XP-4
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
Installation Procedures
Pre-Installation
Guidelines
This section contains information for Johnson Controls 7351J laser smoke
detectors. It includes guidelines for spacing the detectors and for installing
wiring.
!
WARNING: Risk of Personal Injury.
Use of control, adjustments, or performance of procedures other than those
specified in this technical bulletin may result in hazardous radiation exposure.
Spacing Sensors
Wiring Installation
Guidelines
Follow these guidelines for spacing sensors:
•
Space the sensors in compliance with NFPA 72.
•
In low airflow applications with smooth ceilings, space the sensors to
provide a maximum coverage of 81 square meters (900 square feet)
under ideal conditions.
•
Refer to NFPA 72 for specific information regarding sensor spacing,
placement, and special applications.
Follow these guidelines to install wiring:
•
Install all wiring in compliance with the National Electrical Code
(NEC), applicable local codes, and the special requirements of the
Authority Having Jurisdiction and the system control panel’s SLC
requirements.
•
Use proper wire size.
•
Use color-coded installation wires to limit wiring mistakes and to ease
system troubleshooting. Improper connections prevent a system from
responding properly in a fire.
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
5
Detector
Installation
Procedure
!
CAUTION: Risk of Equipment Damage.
Installation with power on may damage the detector and the fire alarm control
panel. Always remove power from the SLC communication line before installing
detectors.
Use the following procedure to install a detector:
1.
Install and wire the detector base (supplied separately). As a guide,
use the wiring diagram in the technical bulletin for the detector base.
2.
Use the detector rotary switches to set the detector to the desired
Signaling Line Circuit (SLC) address. Figure 2 illustrates SLC
Address 14. To set the address switch, do the following:
•
Rotate the right dial so that the arrow points to the address unit
digit.
•
Rotate the left dial so that the arrow points to the address 10s
digit.
IO's
67 8 9
5
10
4
11
3
12
13
2
1 0 15 14
Units
56
4
3
2
10
789
rotary
Figure 2: Rotary SLC Address Switches
Limiting Dust
Exposure
3.
Write the address on the label located on the base.
4.
Install the detector by pushing the detector into the base while turning
it clockwise. This secures it in place.
5.
After installing all the detectors, apply power to connect to the fire
alarm control panel, the SLC, and program the detector into the
system.
6.
Test the sensors using the procedures in the Testing section of this
technical bulletin.
Use dust covers to limit dust entry to the detector during construction,
remodeling, or other activities which produce significant amounts of dust.
However, dust covers are not a substitute for removing the detector during
building construction.
If detectors are mounted in a construction area (with or without the dust
cover in place), thoroughly clean, inspect, and test each detector when
construction is complete.
IMPORTANT:
service.
6
Remove all dust covers before placing the system in
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
Testing and Maintenance
Procedures
All detectors must be tested after installation and after periodic
maintenance. Testing methods must satisfy the Authority Having
Jurisdiction. Detectors offer maximum performance when they are tested
and maintained in compliance with NFPA 72 National Fire Alarm Code.
Testing
This section provides procedures for testing the 7351J smoke detector.
Before You Begin
Testing
Before you begin testing:
Before You Test
Each Detector
1.
Notify the proper authorities that the system is undergoing
maintenance and is out of service temporarily.
2.
Disable specific system functions to prevent unwanted alarms.
Before you test each detector, verify that the green LEDs blink (indicating
SLC polling).
1.
2.
If they do not blink, and LEDs on the other detectors and/or
addressable modules on the same SLC blink, check the following:
•
the connection between the SLC and the detector
•
the control panel’s program to verify that the detector is
programmed correctly
•
the SLC connections at the control panel
If the LEDs on the detector still do not blink, return the detector to
Johnson Controls for service.
After You Test
Each Detector
After you set a detector into alarm by one of the following test methods
and remove the alarm activating device from the detector, reset the system
at the control panel before testing additional detectors. However, if the
Walk Test function of the IFC control panel is being used, reset is
unnecessary.
After Testing and
Maintenance Are
Complete
When you complete maintenance and all subsequent testing, do the
following:
1.
Enable the system functions that you previously disabled.
2.
Notify the authorities that the system is again in normal service.
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
7
Testing Frequency
The sensitivity and function of each detector must be tested after the initial
installation and periodically thereafter. Refer to the NFPA 72 National
Fire Alarm Code for the required frequency. Check with your local
authority for the requirements in your area.
Test Procedures
This section describes the procedures you use to verify detector operation.
It includes four tests; each one tests a different portion of the detector’s
functionality. The tests include:
Table 2: Test Functions
Test
If a Test Fails
When Each Test Is
Complete
When All Testing
Is Complete
8
Description
Functional Test
Use a magnet to test the functioning of the detector.
Smoke Entry Test
Use canned smoke to test for smoke entry.
High Sensitivity Setting
Test
For smoke-free, environmentally controlled applications
If a sensor fails any of the tests, do the following:
1.
Clean the sensor by following the directions under the Maintenance
section of this technical bulletin.
2.
Retest the detector.
3.
If the detector fails again, replace it and return it for repair.
After using any of these methods to cause an alarm, and before resetting
the system control panel, you must do the following:
1.
Remove the alarm source (magnet or aerosol).
2.
Allow the detector sensor to return to its non-alarm state.
When testing is complete:
1.
Restore the system to normal operation.
2.
Notify the proper authorities that the system is again in operation.
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
Four Tests
Functional Test
You can test the functioning of this detector using a test magnet
(M02-04-01). This magnet electronically simulates smoke in the sensing
chamber, testing the detector electronics and connections to the control
panel.
To test the detector, hold the test magnet in the magnet test area as
illustrated in Figure 3. If the detector is functioning properly, the
following occur:
•
Both LEDs latch on within 30 seconds, indicating an alarm.
•
The control panel registers an alarm from the detector.
LED 2
Test
Magnet
Painted Surface
T
Ma e st
gn
et
Painted
Surface
LED 1
position
Figure 3: Test Magnet Position
Sensitivity Test
You may initiate a sensitivity test either manually or automatically by the
Intelligent Fire Controller panel, if the panel is designed and UL Listed to
perform such a test. To verify this, check the technical manual for the fire
alarm control panel.
Smoke Entry Test
Use the Gemini Model 501 aerosol generator to test for smoke entry as
follows:
1.
Set the generator to represent 4% per ft to 5% per ft obscuration as
described in the manual for the Gemini 501 generator.
2.
Use the bowl-shaped applicator and apply aerosol until the detector
alarms. It should alarm after 30 seconds.
Smoke entry can also be simulated from the control panel.
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
9
High Sensitivity Setting Test
The use of the 0.03% to 0.5% per ft sensitivity setting requires a 90-day
test period to ensure that the detector’s environment is suitable for this
setting. For each detector intended for 0.03% to 0.5% per ft alarm
application, follow the steps below to meet Johnson Controls and UL
requirements for this high sensitivity application.
1.
Set the initial alarm setting 0.5% per ft obscuration alarm level.
2.
Set the initial pre-alarm setting for the detector to the intended alarm
setting of the system.
3.
Set the pre-alarm for nonlatching operation.
Notes:
Detectors set at 0.03% to 0.5% per ft are intended for use in
smoke-free, environmentally controlled applications, such as computer
rooms and clean rooms. To determine if an environment is suitable for
installation, operate the detectors continuously for 90 days with all
environmental factors (such as temperature, humidity, air flow,
occupancy) similar to the intended application for these detectors. Use an
electronic history file or printer to record all events associated with the
detectors under testing.
At the end of 90 days, a Johnson Controls branch representative (or end
user trained by a Johnson Controls branch representative), should inspect
the results of the test by reviewing the data collected in the history file of
the system control panel or the record on the system’s printer. If no alarms
or pre-alarms are recorded for the detectors under testing, set the system to
the tested pre-alarm level in the 0.03% to 0.5% per ft range.
Maintenance
This section contains procedures for cleaning the devices.
IMPORTANT:
This detector must be tested and maintained regularly
following NFPA requirements. Clean the detector at least once a year and more
frequently in dirty environments.
Before Cleaning
Before cleaning a device:
1.
Notify the proper authorities that the system is undergoing
maintenance and is out of service temporarily.
2.
Disable the system to prevent unwanted alarms.
!
WARNING: Risk of Personal Injury.
Remove power before disassembling the unit.
10
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
When Testing and
Maintenance Are
Complete
Detector Cleaning
Procedure
When maintenance and all subsequent testing are complete:
1.
Enable the system functions previously disabled for maintenance.
2.
Notify the authorities that the system is back in service.
Use this procedure to clean the detector.
1.
Remove the detector to be cleaned from its mounting base.
2.
Remove the detector cover using a small, standard screwdriver to
release each of four cover removal tabs that hold the cover in place
(see Figure 4).
3.
Carefully vacuum the outside of the assembly screen (the Smoke
Sensing Chamber Cover/Screen in Figure 4) without removing it.
4.
Remove the detector screen assembly by pulling it straight away from
the sensing chamber base (see Table 1).
5.
Use a vacuum or clean compressed air to remove dust and debris from
the sensing chamber.
6.
Re-install the screen assembly.
7.
Align the arrow on the screen assembly with the arrow on the sensor
that points toward the sensing chamber. Push the screen down
carefully until it snaps into place.
8.
Make sure that one of the screen contacts touches the circuit board
contact.
9.
Re-install the detector cover using the LEDs to align the cover with
the detector. Snap the cover into place.
10. Check the rotary SLC address switches to verify that the correct
address is set for the detector mounting base location.
11. Re-install the detector in its mounting base.
12. Restore system operation for testing purposes when all detectors are
clean.
13. Test the detectors as described in the Testing section of this technical
bulletin.
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
11
Detector Cover
RF Shield
Cover Removal
Tabs
Chamber Cover
Smoke Sensing
Chamber Cover/Screen
Photo Diode
Circuit Board
Smoke Sensing
Chamber Base
Spring Contact
To Bug Screen
Contacts to
Mounting Brackets
Smoke Detector
Base
lpx751_2
Figure 4: Screen Assembly and Sensing Chamber
Laser Safety
Information
This smoke detector does not produce any hazardous laser radiation. It is
certified as a Class 1 laser product under the United States Department of
Health and Human Services (DHHS) Radiation Performance Standard
according to the Radiation Control for Health and Safety Act of 1968.
The radiation emitted inside the smoke detector is completely within the
protective housings and external covers. The laser beam cannot escape
from the detector during any phase of operation.
The Center of Devices and Radiological Health (CDRH) of the
United States Food and Drug Administration implemented regulations for
laser products on August 2, 1976. These regulations apply to laser
products manufactured after August 1, 1976. Compliance is mandatory for
products marketed in the United States.
12
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
This smoke detector is designed to activate and initiate emergency action
but does so only when used with other equipment. This detector is
designed for installation in accordance with NFPA Standard 72 National
Fire Alarm Code, or equivalent codes and standards applicable to country
of installation.
Limitations
Consider the following:
Controls Group
507 E. Michigan Street
P.O. Box 423
Milwaukee, WI 53201
•
Smoke detectors do not work without power. Power is provided to this
detector when the SLC wiring provides an electrical connection
between the detector and the properly powered and programmed
IFC panel.
•
Smoke detectors do not sense fires that start where smoke does not
reach the detectors. Smoke from fires in chimneys, in walls, on roofs,
or on the other side of closed doors may not reach the smoke detector
and alarm it.
•
A detector may not detect a fire developing on another level of a
building. For this reason, detectors should be located on every level of
a building.
•
Smoke detectors have sensing limitations. Ionization detectors offer a
broad range fire-sensing capability, but they are better at detecting
fast, flaming fires than slow, smoldering fires. Photoelectronic
detectors sense smoldering fires better than flaming fires. Because
fires develop in different ways and are often unpredictable in their
growth, neither type of detector is always best, and a given detector
may not always provide warning of a fire. In general, detectors cannot
be expected to provide warnings for fires resulting from inadequate
fire protection practices, violent explosions, escaping gas, improper
storage of flammable liquids like cleaning solvents, other safety
hazards, or arson.
•
This detector is UL Listed to operate in a maximum air velocity of
1219 m (4000 ft) per min. Air velocity, along with other factors, may
affect detector sensitivity. See the NFPA 72-National Fire Alarm Code
for information.
•
At least semiannually, test your smoke detector system according to
NFPA 72 National Fire Alarm Code or equivalent codes and standards
applicable to the country of installation.
•
Clean and take care of your smoke detectors regularly. Taking care of
the fire detection system you have installed measurably reduces your
product liability risks.
Published in U.S.A.
www.johnsoncontrols.com
7351J Very Intelligent Early Warning (VIEW) Laser Smoke Detector Technical Bulletin
13